several lighter cuts rather than a single cut. Once you have removed all the delicate parts you can then cut out the main walls. Before starting, plan the sequence of cuts you are going to make, as can be seen below

This is essential to ensure that no parts move or come loose while you are cutting them out.

To ensure the card does not move while you are cutting it out you can pinch the underside of the

workbench with your thumb with your fingers clamping the steel rule to the work piece.

When cutting out the walls always try to cut out the door and window openings first before cutting out the rest of the building. NEVER apply excess pressure to the knife, it's easier to cut heavy card with